mc68hc901fn Freescale Semiconductor, Inc, mc68hc901fn Datasheet - Page 60

• Manufacturer Part Number: mc68hc901fn
• Description: Multi-function Peripheral
• Manufacturer: Freescale Semiconductor, Inc

Electrical Characteristics
8.8 TIMER AC CHARACTERISTICS
Definitions:
Internal Timer Mode:
Pulse Width Measurement Mode:
Event Counter Mode:
NOTES: 1.
8-7
Error = Indicated time value – actual time value
t
Single Interval Error (Free Running) (See Note 2 below) . . . . . . . . . . . . . . . .
Cumulative Internal Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
Error Between Two Timer Reads . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start Timer to Stop Timer Error . . . . . . . . 2 t
Start Timer to Read Timer Error . . . . . . . . . . . . . . . . . . . 0 to – (t
Start Timer to Interrupt Request Error
(See Note 3 below) . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 2 t
psc
Measurement Accuracy (See Note 1 below) . . . . . . . . . . . . 2 t
Minimum Pulse Width. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 t
Minimum Active Time of TAI and TBI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 t
Minimum Inactive Time of AI and TBI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 t
2.
3.
= t
Error may be cumulative if repetitively performed.
Error with respect to tout or IRQ if note 3 is true.
Assuming it is possible for the timer to make an interrupt request immediately.
CLK
x Prescale Value
MC68HC901 USER’S MANUAL
CLK
+ 100 ns to – (t
CLK
CLK
psc
psc
to – (4 t
+ 6 t
+ 6 t
to – (t
CLK
CLK
CLK
(t
psc
psc
MOTOROLA
+ 100 ns)
+ 400 ns)
+ 800 ns)
+ 4 t
– 4 t
100 ns
CLK
CLK
CLK
CLK
CLK
)
)